Mystery #2Tier 1animals / senses / smell
Why can a dog smell things that you cannot smell at all?
Your dog freezes at the door, nose twitching, and somehow knows a fox trotted past hours ago. It can sniff out one biscuit hidden anywhere in the whole house. You, standing right beside it, smell nothing at all. How can a dog's nose be that much better than yours?
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What is your hunch about why a dog's nose beats yours?
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